Ericsson Minilink » History » Revision 8
Revision 7 (admin, 02/19/2016 10:52 PM) → Revision 8/9 (jolly, 02/19/2016 10:52 PM)
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'''NOTE: All information here is collected by us, we have no contact or affiliation with Ericsson. We have no idea how accurate our information-gathering has been.'''
= Ericsson Mini-Link =
Ericsson Mini-Link is a series of commercially very successful microwave links.
They are used world-wide for back-hauling GSM BTS and UMTS Node-B, i.e. for the
A-bis and IuB-links.
Every microwave link is a point-to-point link.
Each side of the link has an IDU (In Door Unit) and ODU (Out Door Unit).
=== IDU (MMU) ===
The IDU is responsible for transmitting and receiving at the respective microwave frequency (normally 7...38GHz).
In the Mini-Link system they are most commonly they are called MMU.
There are different types of MMUs, representing the different link speeds of the microwave link, e.g.
* MMU 34+2 (1 E3 link at 34 Mbps plus 1 E1 link for mgmt)
* MMU 4x2 (4 E1 links at each 2 Mbps)
The MMU has connections for the data links (E1, E3, STM-1, etc.) as well as a coaxial wire connecting it with the
ODU.
You can see photographs of the interior of a MMU in the following album: http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/mmu_34_2/index.html
=== SMU ===
The SMU is a unit that aggregates SDH links, e.g. the SAU 16x2 aggregates 16 E1 links into one E3
http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/smu_16_2/index.html
=== SAU ===
The SAU can control various site-local digital input and outputs throug the management link.
http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/sau_exp1/index.html
=== ODU (RAU) ===
The ODU is contains the actual modem that modulates the E1, E3 or STM-1 link onto the IF (Intermediate Frequency)
which is put on the coaxial link towards the ODU.
Conversely, on a different IF, there is the down-link from the ODU towards the demodulator/decoder in the IDU.
In the Mini-Link system, the ODU is commonly called RAU (Radio Access Unit).
== Hardware Information ==
=== IF-Link between IDU and ODU ===
There are three intermediate frequencies (IFs) that are being used:
* Uplink IF at 350 MHz
* Downlink IF at 140 MHz
* Control IF at low frequency
== Mini-Link Equipment that we have ==
=== RAU ===
==== 7 GHz ====
||Qty||Type||Tx (MHz)||Owner||
||1||RAU1 N 7/11||7426-7484||Jolly||
==== 15 GHz ====
||Qty||Type||Tx (MHz)||Owner||
||1||RAU 15/13||14709.25-14823||LaForge (D)||
||1||RAU 15/16||15024.25-15138||LaForge (D)||
==== 18 GHz ====
||Qty||Type||Tx (MHz)||Owner||
||1||RAU1 18/11||17706.5-18009.5||LaForge||
||1||RAU1 18/15||18716.5-19019.5||LaForge||
==== 23 GHz ====
||Qty||Type||Tx||Owner||
||1||RAU 23/56||22002.75-22513.75||Jolly||
||1||RAU2 L 23/76||22002.75-22288||Jolly||
||1||RAU2 N 23/76||22002.75-22288||Jolly||
||1||RAU2 M 23/77||22288-22590.75||LaForge||
||1||RAU2 M 23/79||23296-23598.75||LaForge||
==== 26 GHz ====
||Qty||Type||Tx (MHz)||Owner||
||1||RAU 26/24||24995.25-25445||LaForge||
||1||RAU 26/29||26003.25-26453||LaForge||
==== 38 GHz ====
||Qty||Type||Tx (MHz)||Owner||
||1||RAU 38/12||37338-37619.75||Jolly||
||1||RAU 38/16||38598-38879.75||Jolly||
=== MMU ===
||Qty||Type||Owner||
||3||MMU 34+2||LaForge||
||6||MMU 34+2||Jolly||
||3||MMU 155/16||Jolly||
||3||MMU 155/128||Jolly||
||2||MMU 4+2/8||LaForge (D)||
=== SMU ===
||Qty||Type||Owner||
||2||SMU 16x2||LaForge||
=== SAU ===
||Qty||Type||Owner||
||1||SAU 1 Exp||LaForge||
=== Other (Not Ericsson) ===
||Qty||Type||Owner||
||2||RAD 34M/E1||Jolly||